HIGHWAY 99: A DOUBLE ALBUM is a musical travelogue that chronicles the epic, American story of one of our greatest musical voices, Merle Haggard.
| Actor | Role |
|---|---|
| TTré BurtSelf | Self |
 John Carter CashSelf | Self |
 Johnny CashSelf [Archival] | Self [Archival] |
 Rosanne CashSelf | Self |
 Tyler ChildersSelf | Self |
 Charley CrockettSelf | Self |
 John DoeSelf | Self |
| FFloyd DominoSelf | Self |
 Bob DylanSelf [Archival] | Self [Archival] |
| SSteve EarleSef | Sef |
| SSierra FerrellSelf | Self |
| JJohn FullbrightSelf | Self |
| BBen HaggardSelf | Self |
| NNoel HaggardSelf | Self |
| TTheresa HaggardSelf | Self |
| NNorman HamletSelf | Self |
 Joy HarjoSelf | Self |
 Jason IsbellSelf | Self |